问题 解答题

脱式计算

6.25-40÷16×2.5

1.8×0.2+2.2×25%

2700×(506-499)÷900

33.02-(148.4-90.85)÷2.5

18.1÷(3-0.299+0.23)×1.

答案

(1)6.25-40÷16×2.5,

=6.25-2.5×2.5,

=6.25-6.25,

=0;

(2)1.8×0.2+2.2×25%,

=0.36+0.55,

=0.91;

(3)2700×(506-499)÷900,

=2700×7÷900,

=18900÷900,

=21;

(4)33.02-(148.4-90.85)÷2.5,

=33.02-57.55÷2.5,

=33.02-23.02,

=10;

(5)18.1÷(3-0.299+0.23)×1,

=18.1÷(2.701+0.23)×1,

=18.1÷2.931×1,

=

18100
2931
×1,

=

18100
2931

单项选择题
单项选择题